modernize code

src/utils.cpp

@@ -247,7 +247,7 @@ std::string utils::point_to_error(Input *input, int failed)
     }
     return cmdline;
   } else
-    return std::string("");
+    return {""};
 }
 
 /* specialization for the case of just a single string argument */
@@ -290,7 +290,8 @@ std::string utils::errorurl(int errorcode)
     return "\nFor more information see https://docs.lammps.org/Errors_details.html";
   else if (errorcode > 0)
     return fmt::format("\nFor more information see https://docs.lammps.org/err{:04d}", errorcode);
-  else return ""; // negative numbers are reserved for future use pointing to a different URL
+  else
+    return "";    // negative numbers are reserved for future use pointing to a different URL
 }
 
 void utils::flush_buffers(LAMMPS *lmp)

tools/binary2txt.cpp

@@ -41,12 +41,12 @@
 #endif
 
 #if defined(LAMMPS_SMALLBIG)
-typedef int tagint;
-typedef int64_t bigint;
+using tagint = int;
+using bigint = int64_t;
 #define BIGINT_FORMAT "%" PRId64
 #else /* LAMMPS_BIGBIG */
-typedef int64_t tagint;
-typedef int64_t bigint;
+using tagint = int64_t;
+using bigint = int64_t;
 #define BIGINT_FORMAT "%" PRId64
 #endif
 
@@ -80,7 +80,7 @@ int main(int narg, char **arg)
     }
 
     n = strlen(arg[iarg]) + 1 + 4;
-    auto filetxt = new char[n];
+    auto *filetxt = new char[n];
     strcpy(filetxt, arg[iarg]);
     strcat(filetxt, ".txt");
     FILE *fptxt = fopen(filetxt, "w");